# US 11,114,253 B2 · Additive material for an electrode of an electrochemical cell, double layer capacitor and production method for such an electrode > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,114,253 B2 - Document ID: US11114253B2 - Status: Granted - Kind: B2 - Application number: 16/332,521 - Filed: 2017-09-05 - Published: 2019-08-01 - Granted: 2021-09-07 - Earliest claimed: 2016-09-12 - Assignees: Heraeus Battery Technology GmbH - Applicants: Heraeus Battery Technology GmbH - Inventors: Daniel Weingarth; Julie Michaud-Bernlochner; Thomas Hucke; Dominik Samuelis - Web page: https://patentgrep.com/patent/US11114253B2 ## CPC - H01G 11/38: Carbon pastes or blends; Binders or additives therein - H01G 9/042: characterised by the material (H01G11/22 takes precedence) - H01G 11/24: characterised by structural features of the materials making up or comprised in the electrodes, e.g. form, surface area or porosity; characterised by the structural features of powders or particles used therefor - H01G 11/42: Powders or particles, e.g. composition thereof - H01G 11/52: Separators - H01G 11/86: specially adapted for electrodes (carbonisation or activation of carbon for the manufacture of electrodes H01G11/34) - H01M 4/133: Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx - H01M 4/625: {Carbon or graphite} - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - H01M 4/587: for inserting or intercalating light metals - Y02E 60/10: Energy storage using batteries - Y02E 60/13: Energy storage using capacitors - H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10) - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract Additive material for an electrode of an electrochemical cell, double-layer capacitor and production method for such an electrode. Known additive materials for an electrode of an electrochemical cell contain electrically conductive particles composed of carbon, such as e.g. conductive carbon blacks or graphites. To provide an additive material having comparatively high ionic conductivity starting therefrom, it is proposed that the carbon additive particles have an average particle diameter in the range of 1 to 20 μm and contain mesopores and macropores which form a three-dimensionally interconnected pore structure. ## Claims ### Claim 1 A conductive additive material for an electrode of an electrochemical cell, the conductive additive material comprising: electrically conductive carbon particles having an average particle diameter from 1 to 20 μm and mesopores and macropores defining a three-dimensional pore structure of interconnected pores, wherein pores with a pore diameter of 10 to 1000 nm make up a cumulative pore volume of more than 0.2 cm3/g, wherein the carbon particles have a microporosity of less than 20% based on a pore volume with pore sizes up to a maximum of 1000 nm. ### Claim 2 (depends on 1) The conductive additive material according to claim 1, wherein the carbon particles have a specific BET surface area from 10 to 600 m2/g. ### Claim 3 (depends on 1) The conductive additive material according to claim 1, wherein the carbon particles have an average particle diameter of less than 15 μm. ### Claim 4 (depends on 1) The conductive additive material according claim 1, wherein the carbon particles have a total porosity from 60 to 85%. ### Claim 5 (depends on 1) The conductive additive material according claim 1, wherein the porosity of the carbon particles is defined by an average pore width from 250 to 700 nm. ### Claim 6 (depends on 1) The conductive additive material according to claim 1, wherein the carbon particles have a specific BET surface area from 10 to 50 m2/g. ### Claim 7 (depends on 1) The conductive additive material according to claim 1, wherein the carbon particles have a specific BET surface area from 100 to 200 m2/g. ### Claim 8 (depends on 1) The conductive additive material according to claim 1, wherein the carbon particles have a specific BET surface area from 60 to 150 m2/g. ### Claim 9 (depends on 1) The conductive additive material according to claim 1, wherein the carbon particles have a specific BET surface area from 400 to 600 m2/g. ### Claim 10 (depends on 1) The conductive additive material according to claim 1, wherein the carbon particles have an average particle diameter of less than 10 μm. ### Claim 11 (depends on 1) The conductive additive material according to claim 1, wherein the carbon particles have an average particle diameter of less than 5 μm. ### Claim 12 (depends on 1) The conductive additive material according claim 1, wherein pores with a pore diameter of 10 to 1000 nm make up a cumulative pore volume from 0.5 to 2.3 cm3/g. ### Claim 13 (depends on 1) The conductive additive material according claim 1, wherein pores with a pore diameter of 10 to 1000 nm make up a cumulative pore volume of at least 1 cm3/g. ### Claim 14 A double-layer capacitor comprising: two electrodes: (i) arranged at a distance from each other, (ii) provided with electrical connections, (iii) separated by a separator, and (iv) wetted by an electrolyte; at least one of the electrodes comprising: a microporous carbon; an active material; a conductive additive material in an amount that is in the range of from 2.5 to 15% by weight of the electrode material, said conductive additive material comprising electrically conductive carbon particles having an average particle diameter from 1 to 20 μm and mesopores and macropores defining a three-dimensional pore structure of interconnected pores, wherein pores with a pore diameter of 10 to 1000 nm make up a cumulative pore volume of more than 0.2 cm3/g, and wherein the carbon particles have a microporosity of less than 20% based on a pore volume with pore sizes up to a maximum of 1000 nm, and a binder. ### Claim 15 (depends on 14) The double-layer capacitor according to claim 14, wherein the active material comprises primary particles having an average primary particle diameter which is larger than the average particle diameter of the carbon additive particles by at least a factor of 3 and the average primary particle diameter is no more than 30 μm. ### Claim 16 (depends on 15) The double-layer capacitor according to claim 15, wherein the average primary particle diameter of the active material particles is from 20 to 30 μm and the average particle diameter of the carbon particles is from 7 to 10 μm. ### Claim 17 (depends on 14) The double-layer capacitor according to claim 14, wherein the carbon particles comprise 4 to 7 wt. % of the electrode. ### Claim 18 (depends on 14) The double-layer capacitor according to claim 14, wherein at least one of the electrodes includes an electrode layer with a thickness of at least 100 μm. ### Claim 19 A method of producing an electrode for a double-layer capacitor comprising: mixing a paste comprising starting substances for an active material; a conductive additive material in an amount that is in the range of from 2.5 to 15% by weight of the electrode material, said conductive additive material comprising electrically conductive particles of carbon having an average particle diameter from 1 to 20 μm and containing mesopores and macropores forming a three-dimensional pore structure of interconnected pores, wherein pores with a pore diameter of 10 to 1000 nm make up a cumulative pore volume of more than 0.2 cm3/g, and wherein the carbon particles have a microporosity of less than 20% based on a pore volume with pore sizes up to a maximum of 1000 nm, and a binder spreading the paste.